Saw jointer



June 8,1926.

P. N. I A-rupp- SAW JOINTER Filed Feb. 11, 1924 nmumr w A W m m Patented June 8, 1926.

UNITED STATES PETER N. LATUFF, OIE ST. PAUL, MINNESOTA.

SAW JOINTER.

Application filed February My invention relates to saw jointers and has for its object to provide a device adapted to be used in dressing up the teeth of circular saws after the same have been sharpened andl set in the usual manner.

An object of the invention resides in pro viding a device which is adapted to dress the extreme points of the teeth so as to make the saw of uniform diameter across any of the teeth thereof.

Another object of the invention resides in dressing the teeth points along the sides of the same so as to cause all of the teeth to project an equal amount outwardly beyond the sides of the saw proper so as to provide uniform clearance and cutting 4qualities for all of the teeth.

Another object of the invention resides in providing a base having a number of detachable mandrels of different sizes mounted thereon upon which the circular saw may be placed.

A still further object of the invention resides in providing-an adjustable support adapted to be mounted upon any of said mandrels which support is formed with clamping means adapted to `hold a file in either of two positions to file the exterior edges or the sides of the points of the teeth of the saw.

Another object of the invention resides in forming said support with means whereby the same may be adjustably attached to any of the mandrels mounted upon said base.

The full objects and advantages of my invention will be found in the detailed description thereof and are particularly pointed out in the claims.

Figure 1 is an elevational view of my 1nvention showing the same applied to a circular saw used in dressing the exterior periphery of the teeth thereof.

Figure 2 is a sectional view taken substantially on line 2--2 of Figure 1.

Figure 3 is a View similar to Figure 2 illustrating the application of the device for dressing the sides of the points of the teeth.

Figure 4 is a fragmentary view taken on line L11 of Figure 3.

Figure 5 is a detail sectional view of the adjusting mechanism drawn to an enlarged scale.

In the use of circular saws, the same upon becoming dull are sharpened either by filing or grindinguntil the worn points of 1,1, 1924. Serial No. 691,976.

the teeth have been brought to a sharp point. The extreme points of the teeth are then set by swaging the same until the `extreme points of the teeth spread outwardly beyond the sides of the saw proper. After this setting has been accomplished it frequently occurs that some of the teeth receive different degrees of set than others, which cause them to project outwardly beyond the periphery of the saw or to the sides thereof, to a more or less varying extent. This has the effect of causing the saw to 0perate inefficiently and to cut with an irregular cut which is highly undesirable, particularly with the saw that runs at a high rate of speed. My invention-overcomes these v disadvantages by providing a saw whereby the teeth of the saw may readily be dressed at the extreme points thereof both along the periphery of the said teeth and along the sides of the same.

In the drawings'I have illustrated a circular saw A having teeth 10 formed along the periphery thereof, and formed with a bore 12 extending through the center of the same. Thersaw A may be of usual con struction, the teeth 10 being cut in accordance with the requirements for which the saw is to be used. The teeth 10 are usuali set along the extreme points thereof which causes the said points to become slightly wider' than the thickness of the saw proper as indicated at 11 in Figure 3. This is for the purpose of causing the saw to clear itself as the material through which the saw passes is cut. Although I have shown a saw of a particular formation in the drawings, .it can readily be understood that the invention may be used with any type of a circular saw, as will become apparent in the following description.

The circular saw A is mounted upon a base 13 which may be attached to the side `of the work bench or to any suitable structure which would make it convenient to manipulate the device in dressing the teeth of the saw as required. This base 11 is tapped at its center at 14 to receive a num ber of mandrels, one of which is indicated at 15. These mandrels are of diiferentdiameter and are adapted to snugly iit Within the bores 12 of the-various saws to be dressed. By selecting the proper mandrel 15 and screwing it into the threaded socket 14C in base 13, a support is provided upon which the sawA may be placed so that which is of a depth such that the file 21 will fit within the saine and project a trifle beyond the lowermost surface of member 16. rlhis recess communicates with the groove 3T and permits the .tile to be placed liatwise relative to the member 1G as clearly illustrated in Figure d with the edge of the lile resting against the shoulder 38 instead of the face of the file as in the other application of the invention. rldhe set screws 59 are so arranged that the same engage the edge of the file 21 when positioned as shown in Figure 3 to force the same against the shoulder 32S and hold 'the same in operating position similar to the manner shown in Figure 1, exceptii'ig that the file is turned the other way. To prevent the set screws 39 from slipping off from the edge of the file a keeper L t2 is provided which is formed on the edge of the head 17 by turning over a portion of the flange thereof as clearly brought out in Figure t. W'hen using the device with the file so positioned the screw 32 is rotated so that the head 17 is drawn inwardly in order that the file 21 may rest upon the portions 11 of teeth 10 as clearly shown in Figure 3. In order that the amount removed from these corners of the teeth may be controlled two screws L13 are employed which are screwed into the support 16 and project a short distance beneath the under surface of the same and engage upon the surface of the saw A. rihese screws serve as stops and limit the distance of the cutting edge of file 21 from the surface of said saw so that as the meniber 16 is rotated file 21 is maintained the same distance from the surface of the saw, hereby cuttingl and dressing the sides of the corners of teeth 10 so that 'the same project outwardly beyond the surface of the saw the same distance throughout.

Vith my invention a saw may be quickly and effectively dressed so that the teeth of the same are perfectly uniform throughout. fill of the unevenness occasioned by setting the teeth may be eliminated so that the saw is of the same diameter throughout and so that the set of the teeth extends the same distance outwardly beyond the surface of the saw for each tooth or beyond the sides thereof. After the screws 43 have been setthe same need not Ibe altered unless a different amount of set is required, so that the device may be used repeatedly by merely inter* changing the position of the file for the two operations. The device is extremely simple and effective and when once the .tile has been worn out, a new file may be readily replaced and inserted in the device so that the same may be at all times in condition for use.

ln accordance with the patent statutes I have described my invention, illustrating the best embodiment thereof, but I desire to have it understood that the invention can be carried out by other means and applied to uses other than those above set forth within the scope of the following claims.

l claim: Y

1. A saw jointer comprising an arm having a longitudinal opening formed therein, a base, a mandrel formed on said base adapted to rotatably support a saw and to pass through said opening, a guideway formed on said arm, a journal movable along said guideway for journalling said arm upon said mandrel, means for adjustably moving said journal with said mandrel along said guideway and dressing means attached to theend of said arm.

2. A saw jointer comprising an arm having a longitudinal opening formed therein, a base, a mandrel formed on said base adapted to rotatably support a saw and to pass through said opening, a guideway formed on said arm, a bar movable along said guideway, a pair of rods secured to said bar, a second rod movable along said bars toward and away from said first bar, said bars being formed with complementary journals adapted to engage said mandrel, means for holding said movable bar in fixed position relative to said rods, a third bar secured to the end of said rods and a threaded member screwable in said third bar and swivelly connected to said arm for adjusting said journal relative to said arm and dressing means positioned upon the end of said arm.

PETER N. LATUFF. 

